1

Laser vs scalpel:
Prk uses a laser to resurface and reshape the front of the eye to improve vision. Rk involves creating multiple radial incisions on the cornea in a symmetrical pattern to flatten the cornea. Prk is much newer and more reliable technology. Rk has many side effects such as regression, irregular astigmatism, and scarring.
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2

Cutting v sculpting:
Radial keratotomy (rk) is an older and rarely performed procedure that has side effects. The eye surgeon makes a series of radial cuts about 90% deep in the cornea to flatten it and reduce or eliminate myopia. Photorefractive keratectomy (prk) uses an excimer laser to reshape the cornea. It is done on the surface of the cornea as opposed lasik which is performed under a flap of cornea.
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3

No:
Radial keratotomy (rk) was a precursor refractive surgery to lasik. In lasik, a circular flap is created and then lifted up to expose the corneal stroma. Then laser is applied and the flap replaced. In rk, radial cuts are made to create relaxing incisions to try and flatten the cornea. Late onset regression and scarring were the side effects. Current technology with lasers is better.
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4

Relatively common:
Prk is second only to lasik as the most common corneal treatment for nearsightedness, farsightedness and astigmatism. Both procedures use a laser to reshape the cornea. In lasik, a flap is first made and the laser is applied under it, while in prk laser is applied directly to the front of the cornea after removing the surface skin. Lasik is more comfortable and one heals more quickly from it.
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5

PRK:
First it is determined if you are a good candidate for the procedure. Prk is done with eye drop anesthesia. You recline in a chair similar to a dentist chair, and an instrument is placed to hold the eyelids open. You look upward toward the laser opening. The surgeon checks the positioning, settings, and alignment, and proceeds with treatment. A bandage contact lens may be placed for comfort.
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6

Yes:
Essentially, yes. Lensectomy is the doctors name for removal of the crystalline lens in the eye, which is the same thing that is done with a cataract operation. It can be done from either the front approach usually used by cataract surgeons, or the rear approach often used by retinal surgeons. In most cases, an artificial lens (implant) is used to replace the removed natural lens.
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7

Depends:
If you have a very dense cataract, the laser can help soften up the cataract for the surgeon. If you have astigmatism, the laser can also help get rid of some of it more precisely. Otherwise, the outcomes and success rates are pretty much the same. Good luck.
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8

Many criteria:
There are many criteria that establish candidacy for any refractive surgery. The prescription, the corneal thickness and curvature and the overall health of the eye are some of these. A consultation with an experienced surgeon is the best way to determine whether you are a candidate for vision correction surgery and which procedure is best for you.
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10

Visibility:
Cryo and laser are used to reattach retinas and deal with bleeding. Cryo is a little cruder but can be used when there is a lack of direct visibility. It is applied outside the eye directed to the inside. Laser requires a visible pathway, is more precise and is applied to the inside. Your retinal surgeon will decide which is best for your problem.
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11

Depends:
The outcomes at 3 months and beyond are essentially equivalent between the two. Prk is used over lasik in a number of situations, such as risk of contact sports, occupation, thin corneas, irregular steepness on topography, or surgeon/patient preference.
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13

Depends :
There are many approaches to provide better vision. Cataract surgery despite all the advantages and even with femto laser assisted cataract surgery still has a higher risk profile than lasik . However if you have visually significant cataracts then lasik a poor choice.
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14

Eye abrasion:
Any eye abrasion is painful, but why do you expect an abrasion from removing and replacing your lens. That can occur, but usually does not. Even so, it would normally be relatively minor and heal in a day or two.
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15

Usually good:
Prk alters the power of the eye by using the laser to sculpt a new lens into the cornea, the window at the front of the eye. Once healed, the vision is usually excellent and so the vision is as if you never needed glasses because in fact you would not need them.
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18

Amost always:
Nothing is 100% safe. Not even driving a car or crossing a street. Lasik is one of the safest procedures around but it's unrealistic to think in absolute terms of "safe" vs "unsafe". The patient has to be willing to sign the consent form that discloses everything that can go wrong (very rarely) and be comfortable taking a small chance for a big reward.
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20

Lower lid surgery:
Can be performed through a skin incision just below the eyelashes (transcutaneous) or through the inner surface of the lower eyelid (transconjunctival.) the latter leaves no visible scar. The former leaves a scar that becomes imperceptible after healing. There are other advantages and disadvantages to both approaches.
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